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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2851221fd77be8a121d896f117b5f50860e6152beb3fea85ef21047615103a41' 
  AND token = '/reysvXk+tQYnWe/+C9fDPHMXNXz6WX8SJ7dZUS/zYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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