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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '152e83746edeb5666578c6788c57751c2330dd21970cda729e7111751c1d9f5e' 
  AND token = 'lU0j6GujJteOWnvQv/beTfl1Tuz4DVPDxrx6vDs0yeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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