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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68760003518c813ebe9ee16383db3cdbac6984440d992cb76004732d61cd9659' 
  AND token = 'ZxNavT8EKPZfEIBbj7cvhPMbUJYK/8t1XwtK3DoEmo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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