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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '169305f9f4fb361ee8810a2212df440a5ce4e90cf1302f7c272f6b0294665eea' 
  AND token = 'BhAO1BsS2Xevwloyg31kkgIrUFUvgGtayZ7lODjO+4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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