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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee99b5d3747b3850e8f6b6fd0e8f204404560a1753b6f1da67eb0d643dea16ea' 
  AND token = '11M4QS40vCZz9IhVe2n8RvpMuPISXPsuDX4xw7n+ykw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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