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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbdb6d64adae5a3e202cf9bcddb3ade4320beab145e3a51b45f39e8d5d5f07a7' 
  AND token = 'cmH/tKmxkNzRf+VXjdN989thrBxAAhsfRa0VBJvXCGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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