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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '544f6a387f5d34faa241c6824088d4d0a0d4a5ef80de1a41e55ea06a838394a5' 
  AND token = '8zpMyyyTUbhXaDlErR2yn3qJ5kTSkxlDQUBUF/QHn1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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