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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5614a74850cb3f751057fc2ffeb5b3f28c934bf31fcbdbf5382aa58e9a0e809c' 
  AND token = 'nU7wae9aFs23HL5t1QYygkzopB6URterZh5ZckHQQMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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