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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7216c7f1d3cf67423b6679d4ddafcf062fd481a4e01ae3008f5ef74b863b5b92' 
  AND token = 'FCJodXmdPBEVtHtTU44uBftm/N+kcB1JUxQrdhcFk9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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