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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88dfe8dc7bef36b968dbe79a5696faf664bf7f73d7e7c6da6a1beb7be883d655' 
  AND token = 'UoG1RWdsqFjHKBDEBHG+3pSeuEwpOcjs+u/rbB5z2PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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