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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6993a3ab390e2d05f16ef18e6abdf4d8a0edaa4f0ef37b3d060e5aaedda5b453' 
  AND token = 'oKf3WasqVTolH6iVEZ6gVoIZKNAK8BaTz11g5Pbhn9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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