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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a0479f742f726ee42c7f5952dffe6ed940607b30a29c4ccbbe0d6dcf882bd73' 
  AND token = 'BEfAEGp0v3GTwftUMfvqtWcmfAr2r4yJBo1hKLtLT0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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