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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49d96a86268059fdc570ff4bd23d4d3c5e698d49331897fca819dabba4f62cc0' 
  AND token = 'O9iO7fl3HyiMAfW3v6VFXaQlehdE7yUf9LEt2//oJN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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