SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fc614f3463497541ec22733a05e66f970f2e6341f255b2110247e062f8e392b' 
  AND token = 'q0AqlVVbEVvHQJgUAVL+Gk+5yG5YsOWKa9G2rRTuOSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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