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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a430aa38552353054d504f07fd21c5141aea3b1da24d23e6d77c1efc182e21' 
  AND token = '96rNKA8W3m3qk/XpvfazkLI4o4oMqIX/ffCbAvnKfvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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