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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b333979a8224e89ba2ab11f34d1668a885816f214b92b3eb3460911497588c4' 
  AND token = 'idGlIBGh9M7dDN54dluk12RAWKFRHR1QEZQvJhYogeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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