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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34db3da4dbe2340c3d6eab19cbfea8f19d915a3878f1f5a9831b077e48ecd7da' 
  AND token = 'gV+LeREXzMRrthpe/Q0VO3B+dm4teFkTjbFgTWTPJh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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