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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72d113cf33730f618a033193ae6aa8468c732d8999dd29f09871ca64e0d69c2a' 
  AND token = 'nHQw3tyLTqc0F+cEtmkFnLqOYgox1eWV7EugDIJ3Bwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}