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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3f5d8cc9703db1984762cc5f80d6262ae76d3711988dcfefe6b1ebdebde0776' 
  AND token = '3ai1k2RUwXurnESoACYHhUjYm9IlOiCZnRDEXWQEos8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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