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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '252925932a67fef2dde7af25f6ee187d196dc065e46582253b949e10fe432b9c' 
  AND token = 'HhlQFFhOLGnHE2dJPdbH9wBBWQm0UwmCNXpfXyBEVa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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