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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eb93ac73cbf17ab80398e9f878a547695bf7bbebd11b56f76dcc275fd1da0cb' 
  AND token = 'L5eUvweuEx0aaqw8+pSuajw125+GJfEA1KLwrI0kX8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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