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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6369f3626411f59728498e71fb676484cad5a78781f81673c9c152f8cef19f91' 
  AND token = 'APNfYNGC/82U4GClbqPFCJJcy0LIJQ1dN8pen1Ppnfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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