Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21cb4e27dce9719e23398d9ffb7c6fab620533062eacbb9c3441ccb04e9c5b1a' 
  AND token = '1nAgnNcyOiBIvEONxLRj00YNtsW79zXAHOfKq9T4TEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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