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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fd0763fd4c5bc2ff9be20270f790318d13f4d274d9b0b19e82685e9739ecb20' 
  AND token = 'SyF9GD7zznvm+T0kjrpKeUc1vgRjw9a569mSGRj5aaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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