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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd7e1638f3f2eda3fa405d8bf38d25ba90a6b24e559e62132c6005301a002d0e' 
  AND token = 'khIieBhLu+VEVF1yN236/Fz0qFSiJ8WEx84UpsiTS9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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