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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecf5cb0347ef9e11993b19eb772cbaf5eb07f32f5af9f6af5465dc08453d9899' 
  AND token = 'iyNzfiQ78/Tt2P6AxN7rW+o3Z0aiqO2GA4N2IJvBgnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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