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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a990d56acb00d2de6cad549dbd4cc1eb58c1e5acf4820eb905555a9b3719fcad' 
  AND token = 'DVkdblEBlLmSyTnz1da3ifL5y9jsnofqrejkDiLY75s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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