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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87b8168f16065860440c680ce626e912d2721ee13900d2d20c105b9674dc998' 
  AND token = 'ajdaKgSB889UCI24x0jb6AYjH4gahF4w8pN1HHPB3Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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