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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1548a0a5b34cd69d437fe327072fb398752c248c2c283ac431dedda4f78b5d68' 
  AND token = 'kRsKqYT2CWMflPydLaOGkDHCqdX476GZESyZj8IJPB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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