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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '811e9c788baaf34a77e38319e8726b15038e1f12a65c189f813eec3bc276be01' 
  AND token = 'btRz/4UZK7//0DnBRHvCoflZqqKxg7OcFuSTmiqZ8zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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