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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a65c228e2b195be70de1336c3219663fda7b5228e541bc4ae31f3fe3a703220' 
  AND token = 'asIaKIdy74kEurYXcH4hc2IGfCC7bOZWHw086WcO1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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