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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bc0e81e7488db154f0c9d383909daeee968e9b6c8e3aa94686031b153fb9572' 
  AND token = 'pCqKH3BCF4Ezw2A9bHDWKIv30TTZKgnUWZC8of5b9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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