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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0660c38c3241b770eb44b8a07f4b74baf0f04e9dc7a6d167509fa073b41345fa' 
  AND token = 'xzISIDz5CdjCaF8YrdXNhDSWwDiji8Ak0O3CvGm1nnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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