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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b6a7bbd6efbfd087ea6a8353d9afaabd51bfebe7f8bf84bcf1d4ec22009b99c' 
  AND token = '5+IiOaa3EH2W4lV2ctkiq1eAOZZPjCqAskgBR2Pxz8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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