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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e5e2a2e95d3e77e25785622cb6c0eb857d53ebc8d7d1d4d6e3205995da01f91' 
  AND token = '1alLWzhcGEhWL6eF7PmHHHnJ9yHDuk3ZtjjTHrUX1Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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