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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d8a62b3efcae322658e330b9319b58d81aabe2d0b0e3e4b4d6b538109bb690' 
  AND token = '3ORquCDdFq7+8myUQhWfHvjIot3MK0b8k8voWHlZ/84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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