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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc4f36815c41e0359247fbf3bfdce8bde3d18481365add8c16188140859478b' 
  AND token = 'Cp11IWXSNN+UuLUTI76hyHlaT8SVNgf0QE9eVqIII8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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