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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82e57cf9b069d9388ebfa962b854d88d08cf65a4d428b19cf59bd4bd75a0e613' 
  AND token = '+jWL9K9kc+Ae4K0IlfgR3onhJnVNiDmu4uBE8yy0Nn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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