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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20545c15952997aae11df5a3deea163bbe5fa07cd9ef0321c413802b8c24dd76' 
  AND token = '3bHZ80u8f4+PSlM+h4flP14TuFSNPa40f1LA38suTUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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