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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40690637304583ac98828876cb014b03539997e4679b9327c0862b477c3c22d5' 
  AND token = 'oePilrRHTpUJeWxdOmJ6vnIElkxpBgyxtD/AGx/OsjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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