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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32785c0c141efbf45746ce0334667519af51d9552feb63b2c7af3e2beac3860c' 
  AND token = 'H2b9fZZdgGK4GAInQNLDIGAzrIajbErpK9hfYmcqx5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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