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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d3d3b1125adce66b3805b034a9942dd17aa5df649830a884ab6c0c4b71ea8e4' 
  AND token = '0NdwmYPe62Zl6eB6uoMNxFawOS0zrqCjC36QiMHjveA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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