SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a754e453e74c8140b1bfa687428399b9d10a86d2e18622ab21f5c5a32fce7d07' 
  AND token = 'NP2fguiIGMEzAKovVVzVERMgbBsE4tQOwxmdFTl2xMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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