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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bd8866ffabcb76207c570c1581d8e6d4472346ba1d8ad7b91ba81bf2230ed11' 
  AND token = 'JJAQvfWSPIQiI8Ssdg4rNp8Tx0WD2zlknQSLptQNTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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