SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dd84ec8f41a496b0b59ac62b52cf8d62b768130d18ba674e503e097138d807c' 
  AND token = 'QzzB5whItYsgqMvo3lfIwcyEXSU5d+/mF344KeH/4iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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