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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a085e53627e8e0aeb524c3af4542432f8313b416366ead584066a57d1cb4dbc' 
  AND token = '6dH7vo38uWKmn+5Dj6cFzbx33lv5RzBQeqcZNEgPFbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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