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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '363d800ab441752fbabbe42ce996bb06b3374f08c96db7e509c47a7b16e238cc' 
  AND token = 'Jr+idzyJ3JMlwyrbznEX7cazaK1I8OFs1PgvoWEqokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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