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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c18747b1dc547c15d9f33fcf929eb9df6557599953671976fb6bfe58c5f04a' 
  AND token = '2o3/mZOYO33uVCXKuZo2ccQo+t0LmvIOtfZz7cgE3rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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