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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ed8b8d6c1d13755542ea0960a94257b7bfd6db93027b1ea54fcebcc977ac603' 
  AND token = 'yS3HdVL6BU/CeIrYJneOktGV5aVvkcwQ3oqSceycjGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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