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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f73666e5bfb8a2355819a6d9fd16bdf473cc47b304cbb01e0f9fc045b1280317' 
  AND token = 'qAFyhBvkIepLfbn0EC9r23ojN88YojK8+D+qP8Mr3tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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