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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c3ae5a6494b40d3f2a1731f681e95c8ee41c5ae6af6a703ba9e8676a08ac07f' 
  AND token = 'eZWHzb+F1td1LKfOGd7lKBL4lbm3GbQaBEMQlciRQDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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