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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a43ad6d9ac5987858df3d0d5d779651f4f5c30f524d23d22c2a5380fdc0bd89' 
  AND token = 'QWy0h56QoxVnU7vaSqkqYlYqW1JMyC7ydENqBzqlBTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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