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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a987f7c4e466c40a82c769143a1694a8e080dc076c04a5bdba429e884124cab4' 
  AND token = 'ihRiRGz8sOOjQlLfUZZ3xiaNXCQvIOcc5PG4YB6Hfkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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