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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1477940e6084da4361faac3fdfd46d42cc8bd697b0530995f04d36f18b92aec' 
  AND token = 'UTTODTmA4Z4np9tW6b0ngQMIddSXXwx+Lr1NbLC/Xms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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