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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94064ab4047ea4203339d9c708b70c253222845ecf408af459b77b300de8864' 
  AND token = 'X3G3RKehS8daUNV7dgzvqZzVysN8dMkL3Yi6uHUr01c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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