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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be86133cb1c78b9cfe3df5cb587a4e7db1a042844f80c00ab9eb3081e12ec7f3' 
  AND token = 'QTwyVtIN5sGLkEQVuNXVZK9sQY0b9yxzEHVVdwrUDuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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