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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07473a2ae099e47e1840c7815f06e971b728dac3caefb7ef3d3fa31f35b5f49c' 
  AND token = 'uVvV17jT5M+gLa75SS5kSPs9Km+uN729usaBnEvrde0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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