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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '079cdb6a7689b7ea04076165fdfb1872fc1433a68bac61ea2207883cde9864ed' 
  AND token = 'CAE4MymdE/DcCnpevOBS2VJjI/c4QAQhO+Qxko1qBvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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