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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3640d64ca92c47cef29eaf5b07bd06f46f306354b0fb5b9e77ff4d34bb20724' 
  AND token = 'wf/aEbUGoV7aBYEHir8TjqhM2kcx5n7OT5HoKbjIdww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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