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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62768929b47a272fdaf27d7345f643ff58f345e97c574cb66315674c42fae9af' 
  AND token = 'Yj1w6q52BtUVk5ZAgMv7JUa65LLQoxaBANE1vMriRlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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