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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '664c39ae8b5684d53a5b898cc97009aedba14b083a82825637971bc9d4f864ca' 
  AND token = 'xyasx+rGCq1d0KqjcL0T9k8LcTm5wrWOy4GncvzivQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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